Knife



G. R. KENNERLEY KNIFE Filed March 13 1945' GEORCE BRANDALL KENNERLEY yPatented Aug. 2, 1949 UNITED STATES PATENT OFFICE KNIFE ApplicationMarch 13, 1945, Serial No. 582,541 In Great Britain April 4, 1944 2Claims. 1 This invention relates to improvements in knives or the liketools especially of the pocket or penknife type.

One object is the provision of a very compact bladed tool particularlysuited for carrying in the pocket.

Another object is to effect improved protection of the blade.

A form of the invention consists of a blade, which may have one or twoedges, longitudinally displaceable inside a casing with a substantiallyrectangular opening at one end, the blade being emergeable through saidopening. An extension to said blade carries a screw means andcomplementary screw means constituted by a loose rotary inherently rigidpropulsive component is contained within the casing, so that rotation ofthe propulsive component imparts longitudinal displacement to the blade.

In the drawings:

Figure 1 is a longitudinal section partially in elevation showing thearrangement of parts, with the blade retracted.

Figure 2 is a longitudinal section viewed. at right angles to Fig. 1 butotherwise similar thereto.

Figure 3 is a longitudinal section partially in elevation viewed in thesame direction as Fig. 2, but with the blade extended.

Figure 4 is an elevation of the blade, viewed in the same direction asFig. 1.

Figure 5 is an elevation of the blade, viewed in the same direction asFigs. 2 and 3.

Figure 6 is a detail of the spring washer, viewed in a direction similarto Fig. 1.

Figure 7 is a corresponding end view of the washer.

Figure 8 is a front end view of the case.

Figure 9 is a detail of a plug for transmitting drive to the rotarypropulsive component.

Referring to Figs. 1 to 8, a knife blade 10 has a portion Illa formingpart of a propelling device; the portion 10a terminates in an obliquelygrooved lug lile. The blade is contained in a casing ll, internallycylindrical at I la and having a fiattened tubular portion llc throughthe end of which blade I is emergeable.

Blade movement is effected by a rotary propulsive component 14 helicallywound from hard round bar and resembling (in appearance only) a coilspring, although actually substantially rigid.

A drive plug or spindle I! has an end portion Ila sweated or otherwiseattached, to one end of component 14 and has an enlarged diameterportion [1b, a groove l 10 and a groove lld. Plug or spindle I 1 passesthrough a felt washer I8 located in groove I I0, and thence through abore in a bush l pressed into the end of the casing.

Dished washer 19, which fits in groove lld, retains the drive plug incorrect axial relation to bush l5. Rotation is efiected by a knob (notshown).

In the construction described it will be seen that the blade isrestrained from rotation by engagement with the opening 1 lb in thecasing through which the blade emerges.

The blade of the knife or the like tool may be a knife blade, a fileblade or a saw blade or may be a combination or subcombination of knife,file and saw.

I declare that what I claim is:

1. A bladed tool such as a knife comprising a blade having alongitudinal rearward shank provided adjacent its rear end with a lug, arigid casing adapted to receive said blade and its shank and having aslot at one end for projection ther through and support of the blade,and a rotatable member formed as a helix axially fixed within saidcasing and engaging the lug of said shank whereby rotation of saidrotatable member will cause projection or retraction of the blade fromor into the casing, said rotatable member lying closely within thecasing and surrounding the shank so as to serve also as a bearing forthe shank and thus for the blade, said lug formed with a slot to receivea portion of a convolution of said rotatable member, the said slot beingobliquely inclined to correspond with the obliquity of the convolutionsof the rotatable member.

2. A bladed tool such as a knife comprising a blade having alongitudinal rearward flat metal shank of substantially rectangularcross-section provided adjacent its rear end with a lug, a rigid casingadapted to receive said blade and. its shank and having a slot at oneend for projection therethrough and support of the blade, and arotatable member formed as a helix axially fixed within said casing andengaging the lug of said shank whereby rotation of said rotatable memberwill cause projection or retraction of the blade from or into thecasing, said rotatable member lying closely within the casing andsurrounding the shank so as to serve also as a bearing for the shank andthus for the blade, the depth of said shank being such as to enable theshank to fit closely within the convolutions of the helical rotatablemember.

GEORGE RANDALL KENNERLEY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name 7 Date 24,502 Sturdy June 21, 1859885,190 Smith Apr. 21, 1908 1,375,029 Valeggia Apr. 19, 1921 1,442,964ORourke J an. 23, 1923 1,454,136 Pollak May 8, 1923 1,461,437 BillmanJuly 10, 1923 2,243,030 Fischer May 20, 1941

